BA2101, SM9403 dimming control application specific integrated circuit

VDI, VD4, R3 and C4 form a simple resistor step-down voltage stabilizing circuit, which outputs a DC voltage of about 9V for
powering the integrated block. R4 is the AC synchronization signal for the integrated block, R5 is the external oscillation resistor of the integrated block, C3 is the isolation safety
capacitor, and M is the touch electrode. When a human hand touches the electrode M, the AC clutter signal induced by the human body
is sent to pin 4 of the integrated circuit through C3, R8, and R7. After being processed by the internal circuit of the integrated circuit BA2101, the trigger signal output from pin 6
is added to the output through Cl and R1. The gate of the thyristor VS turns on the thyristor VS and lights the lamp H. When M is touched for the second time,
the arrival time of the leading edge of the output pulse of pin 6 can be changed, thus changing the brightness of the lamp. Touch the electrode sheet M repeatedly, and the brightness of the bulb H
will change in cycles by pressing low light-medium light-high light-off-low light-... Increasing or decreasing the values ​​of discharge resistor R6 and discharge capacitor C2
can change the brightness difference of each block. From the above analysis, it can be seen that this circuit is a 4-speed touch dimming controller , which is suitable
for dimming table lamps, wall lamps and speed adjustment of electric fans.